There are certain things you can’t really demonstrate in the same way as other pieces of consumer electronics. A WiFi-connected urine analyzer that sits in your toilet and samples your pee for analysis is one such gadget. That’s why I had to go to a behind-closed-doors event in a private suite here at CES in Las Vegas to test out this prototype version of Withings’ U-Scan.

U-Scan is Withings first attempt at a body fluid-analysis device, albeit one with the weight of such a well-regarded brand in the health tech space. The shell-shaped hardware sits on the edge of your bowl like a scent block, and catches a small sample of fluid while you’re micturating. After around a minute, users will find conclusions about their menstrual cycle or nutrition, depending on what cartridge is installed, pushed to their phone.

Regardless of biology, you’ll need to sit down on the toilet to use this thing, and that it’s a little surprising when the hardware lights up when it starts working. You’ll certainly know when it is as well, since it makes a fairly noticeable whirring noise while your sample is processed. At this early stage, I was able to receive information about two stats: The pH of my urine as well as its specific gravity.

Now, I could reveal what my stats were, but I’d much rather not spoil the video where you can learn a little bit more about how it all works.